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Prof Frankum isn't surprised by the Kiwi actor's attack but warns people not to look to celebrities for public health advice.

"They may be good actors or, in this case, wine producers but their skills are usually not geared towards making public health policy," he said.

"The lockout laws have been a great success for people's health and safety in Sydney."

The laws, which require central Sydney venues to turn people away from 1.30am and serve last drinks by 3am, were introduced in 2014 following a number of one-punch deaths and assaults during alcohol-fuelled nights out.

Serious facial trauma admissions at Sydney's St Vincent's Hospital have dropped by around 60 per cent since the laws were introduced.